The answer to 'why is my bathroom pet stains' is that pet urine, feces, and hair can leave unsightly and smelly stains on bathroom floors, walls, and fixtures. This is a common problem for pet owners, especially if pets have accidents or are allowed in the bathroom unsupervised.
The main causes are pets marking their territory, having accidents due to illness or old age, or simply not being properly trained. Symptoms include discolored surfaces, lingering odors, and potentially bacterial growth. To solve the issue, you'll need to thoroughly clean and disinfect the affected areas, and consider training your pet or restricting their access to the bathroom.